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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc0082609d25115327642c583a7987bda70320005a27e2055aa9395a9b16610' 
  AND token = 'txUJjYm+/YQqx2ejDHNe2wFyJf7djR4GkEXU7J0MtrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}